Inferior MI and AVNRT or Accelerated Junctional Rhythm

Interpretation

RBBB.
ST Elevation in Inferior Leads (II,III,aVF) with reciprocal ST Depression in Lateral Leads (I,aVL).
Q waves (QS waves) in Inferior Leads.
Left Axis Deviation (LAD) due to QS waves from Inferior MI (probably acute).
Regular Narrow Complex Tachycardia at a rate of 150/min with retrograde P waves after every second QRS. There are two possibilities for the tachycardia:
1. AV Nodal Reentry Tachycardia (AVNRT) with 2:1 atrial activation
2. Accelerated Junctional Rhythm with 2:1 retrograde conduction

READ MORE about : ECG Interpretation